<template>
  <div class="params">
    <!-- 卡片视图 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert
        show-icon
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
      ></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="casteProps"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClose(index, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClose(index, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="`添加${titleText}`"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 内容主体区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog
      :title="`修改${titleText}`"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 内容主体区域 -->
      <el-form
        :model="editForm"
        :rules="addFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="`${titleText}`" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import {
  getCateList,
  getParams,
  addParams,
  getParamsById,
  editParams,
  deleteParams,
} from "@/api/index";

export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 指定级联选择器的配置对象
      casteProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: "many",
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      // 添加表单的验证对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // // 控制按钮和文本框的切换显示
      // inputVisible: false,
      // // 文本框中输入的内容
      // inputValue: ''
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data, meta } = await getCateList();
      if (meta.status !== 200) {
        return this.$message.error("获取商品分类列表失败！");
      }
      this.cateList = data;
    },
    // 级联选择框选中项变化会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // Tab页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
    // 获取参数的列表数据
    async getParamsData() {
      // console.log(this.selectedCateKeys)
      // 选中的不是三级分类，就重置数组
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
      }
      // 选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的id和当前所处的面板，获取对应的参数
      const { data, meta } = await getParams({
        id: this.cateId,
        params: { sel: this.activeName },
      });
      if (meta.status !== 200) {
        return this.$message.error("获取参数列表失败");
      }

      console.log(data);
      data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        // 添加一个布尔值，控制文本框的显示与隐藏
        item.inputVisible = false;
        // 文本框中输入的值
        item.inputValue = "";
      });
      console.log(data);

      if (this.activeName === "many") {
        this.manyTableData = data;
      } else {
        this.onlyTableData = data;
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data, meta } = await addParams({
          id: this.cateId,
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName,
        });
        if (meta.status !== 201) {
          return this.$message.error("添加参数失败");
        }
        this.$message.success("添加参数成功！");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 点击按钮展示修改的对话框
    async showEditDialog(ID) {
      const { data, meta } = await getParamsById({
        id: this.cateId,
        attrId: ID,
        params: { attr_sel: this.activeName },
      });
      if (meta.status !== 200) {
        return this.$message.error("获取参数失败！");
      }
      this.editForm = data;
      this.editDialogVisible = true;
    },
    // 监听修改对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮修改参数
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data, meta } = await editParams({
          id: this.cateId,
          attrId: this.editForm.attr_id,
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName,
        });
        if (meta.status !== 200) {
          return this.$message.error("修改参数失败！");
        }
        this.$message.success("修改参数成功！");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    // 根据id删除参数
    async removeParams(ID) {
      const confirmResut = await this.$confirm(
        "此操作将永远删除该参数，是否继续？",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);

      if (confirmResut !== "confirm") {
        return this.$message.info("已取消删除");
      }
      // 删除
      const { data, meta } = await deleteParams({
        id: this.cateId,
        attrId: ID,
      });
      if (meta.status !== 200) {
        return this.$message.error("删除属性失败！");
      }
      this.$message.success("删除属性成功！");
      this.getParamsData();
    },
    // 文本框失去焦点，或按下Enter键，都会触发
    handleInputConfirm(row) {
      // console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      // 如果没有return，则说明有输入的内容，需要做后续的处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      this.saveAttrVals(row);
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获得焦点
      // $nextTick方法作用： 当页面上元素被重新渲染之后，才会执行回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    },
    // 将对 attr_vals的操作，保存到数据库
    async saveAttrVals(row) {
      // 需要发起请求保存操作
      const { data,meta } = await editParams(
        {
          id: this.cateId,
          attrId: row.attr_id,
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" "),
        }
      );
      if (meta.status !== 200) {
        return this.$message.error("修改参数项失败！");
      }
      this.$message.success("修改参数项成功！");
    },
  },
  computed: {
    // 如果按钮需要被禁用，返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    },
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>